NDLI: Leakage Current Elimination in Transformerless Photovoltaic Grid-tied Inverters with Neutral Point Clamped Full-bridge Topologies

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Leakage Current Elimination in Transformerless Photovoltaic Grid-tied Inverters with Neutral Point Clamped Full-bridge Topologies

Content Provider	Semantic Scholar
Author	Kumar, T. Praveen
Copyright Year	2015
Abstract	Eliminating the leakage current is one of most important issues for transformerless inverters in grid connected photovoltaic applications. Due to the characteristics of low cost, smaller size weight and high efficiency the transformerless PV grid connected inverters have attracted more attention in the application of photovoltaic generation system. The technical challenge is how to keep the common mode voltage constant to reduce the leakage current. However, the leakage current through the parasitic capacitors and the utility grid is harmful. Neutral point clamped (NPC) topology is an effective way to eliminate the leakage current. In this paper, two kinds of basic switching cells, the positive neutral point clamped cell and the negative neutral point clamped cell,are proposed to built NPC topologies, with a systematic method of topology generation given. A novel positive–negative point (PN-NPC) topology is analyzed with operational modes and modulation strategy. The PN-NPC topology exhibits similar lekage current with the full –bridge inverter with dc bypass (FB-DCBP) which is lower than that of the oH5 topology. The performance of proposed topology is confirmed through simulation investigations. Index terms -Common mode voltage, grid-tied inverter, neutral point clamped inverter, Photovoltaic(pv) generation system
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://ijpres.com/pdf15/49.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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